docs: def tensor_components_to_use(mrr, mtt, mpp, mrt, mrp, mtp):
      '''
      Converts components to Up, South, East definition::
  
       USE = [[mrr, mrt, mrp],
              [mtt, mtt, mtp],
              [mrp, mtp, mpp]]
      '''
      return np.array([[mrr, mrt, mrp], [mrt, mtt, mtp], [mrp, mtp, mpp]])